Next story in Space

Bad weather in Florida thwarted the U.S. Air Force's
attempts to launch its latest secret X-37B space plane Friday
(March 4), forcing a one-day delay for the robotic reusable
mini-shuttle.

The unmanned X-37B space plane — known as
Orbital Test Vehicle 2 (OTV-2) — was supposed to take to the
skies from Cape Canaveral at 3:50 p.m. EST (2050 GMT) today atop
an Atlas 5 rocket. But cloudy, windy conditions caused officials
to scrub that attempt, as well as a second try around 5:30 p.m.
EST (2230 GMT).

Thick cumulous clouds were within 10 miles (16 kilometers) of the
launch complex, presenting an unacceptable risk of lightning,
according to officials with the United Launch Alliance (ULA),
which is overseeing the OTV-2's launch. [ Photos:
Flight of the X-37B Space Plane ]

"We made a valiant attempt, but the weather is not cooperating
for today," a launch controller said.

The foul weather didn't catch mission planners off guard — Air
Force officials had said in the days leading up to the launch
attempt that there was a 70 percent chance of a delay caused by
weather.

The next launch opportunity comes tomorrow (March 5) at 4:09 p.m.
EST (2109 GMT), ULA officials said. But the lousy weather could
still be a problem, with launch controllers estimating a 70
percent chance of another weather delay.

When it does blast off, OTV-2 will embark on the X-37B's second
space mission. The Air Force's other X-37B vehicle, known as
OTV-1, launched last April and returned in December after seven
mysterious months in space. [ Infographic: The
X-37B Space Plane ]

With its blunt nose and stubby wings, the unmanned X-37B
spacecraft resembles a miniature version of NASA's space
shuttles.

The X-37B is about 29 feet long and 14 feet wide (8.8 by 4.2
meters), with a payload bay about the size of a pickup truck bed.
It is designed to launch vertically inside the nose cone of a
rocket, stay in orbit for months at a time, and then land
horizontally on a runway like a space shuttle.

The X-37B's cost, payloads and missions are classified. Partly as
a result of this secrecy, some concern has been
raised—particularly by Russia and China—that the vehicle is a
space
weapon of some sort.

But Air Force officials have repeatedly denied that charge,
claiming that the space plane's main task is to help test out
technologies — such as new guidance, control and navigation
systems — for future satellites. Some experts think the X-37B is
trying out hardware for
next-generation spy satellites, which would explain all the
secrecy.

Boeing's Space and Intelligence Systems division builds the X-37B
for the Air Force. Originally, NASA used the space plane as an
experimental test bed until funding for the project ran out in
2004.

The vehicle then passed to the Defense Advanced Research Projects
Agency and was ultimately turned over to the Air Force in 2006.

The United Launch Alliance will provide live coverage of the next
attempt tomorrow. Watch the webcast
here.